What Copilot in Excel actually does

Copilot in Excel is an AI feature built into Microsoft Excel that suggests formulas, explains data patterns, and helps you write functions without memorizing syntax. It does not replace your work — it reads what you have already typed and offers completions or explanations. You turn it on through your Microsoft 365 subscription, and it runs locally on your computer alongside Excel, which means it uses your machine's processing power.

The feature works best when you have already started typing a formula or selected a range of data. If you type =SUM( and pause, Copilot suggests what comes next. If you highlight a column of numbers and ask it to "show me the trend," it can write a formula to calculate that. It does not make decisions for you — it shows you what is possible and lets you accept or reject each suggestion.

Key Takeaways

  • Copilot in Excel requires a Microsoft 365 subscription (not a one-time Office purchase) and is available on Windows and Mac versions released in 2024 or later.
  • The feature uses your computer's processor and memory while it runs, which can slow other programs if your machine is already under load.
  • You enable Copilot through the Insert menu in Excel, and it appears as a side panel where you type requests in plain language.
  • Copilot works best when you give it context — selecting data first, or describing what you want to calculate — rather than asking vague questions.

System requirements before you install

Copilot in Excel is not a separate read. It comes with Microsoft 365 if your subscription includes it, but you need the right version of Excel to use it. You must have Excel from Microsoft 365 (the subscription version), not Excel 2021 or earlier one-time purchases. On Windows, you need Excel version 2404 or later. On Mac, you need Excel version 16.84 or later. You can check your version by opening Excel, clicking the menu (three dots on Mac, or File on Windows), and looking for "About Excel."

Your computer also needs to handle the background processing. Copilot runs on your machine, not in the cloud, so it uses RAM and CPU cycles while it thinks through suggestions. If you have less than 4 GB of RAM or an older processor, you may notice Excel becomes slower when Copilot is active. Closing other programs before you use it can help. You also need an active internet connection to authenticate your Microsoft 365 account, though the actual AI processing happens on your device.

How to turn on Copilot in Excel

Open Excel and create a new spreadsheet or open an existing one. Click the Insert tab at the top of the ribbon. On the far right of the Insert tab, you will see a button labeled Copilot (it looks like a small sparkle icon). Click it. A panel will open on the right side of your screen with a text box that says "Ask Copilot anything about your data."

If you do not see the Copilot button, your subscription may not include it yet — Microsoft is rolling it out gradually to Microsoft 365 accounts. You can check whether it is available to you by going to your Microsoft 365 account settings online and looking for "Copilot" in the features list. If it is listed but not showing in Excel, try signing out of Excel (File > Account > Sign Out) and signing back in.

What to ask Copilot and how to get useful answers

Copilot works better when you give it context. Instead of typing "analyze this," select the data first, then ask "show me the average by month" or "find the highest value." The more specific your request, the more useful the suggestion. If you want a formula to calculate something, describe what you want in plain language: "create a formula that multiplies column A by column B and adds 10 percent tax."

You can also ask Copilot to explain what a formula does. Paste a formula into the text box and ask "what does this do?" and it will break down each part. This is useful if you inherited a spreadsheet and need to understand someone else's work. Copilot can also suggest ways to visualize your data — ask "what chart would work best for this data?" and it will recommend options and show you how to create them.

Copilot does not always get it right on the first try. If a suggestion is close but not quite what you need, you can ask it to adjust. For example, if it suggests a formula that almost works, you can say "change that to only count cells where the value is greater than 100" and it will revise. You always review the suggestion before you accept it — nothing is inserted into your spreadsheet until you click the checkmark next to the suggestion.

Performance impact on your computer

When Copilot is active and thinking through a request, it uses CPU and RAM. On a modern computer with 8 GB of RAM or more, you may not notice much difference. On an older machine or one with limited memory, you might see Excel slow down, or other programs become sluggish while Copilot is processing. If you notice your computer struggling, close Copilot when you are not using it by clicking the X on the panel.

Copilot also keeps a history of your requests and the data you asked about, stored on your device. If you work with sensitive information, be aware that your requests are logged locally. You can clear this history by going to Excel settings and looking for privacy or data options, though the exact location varies by version.

Troubleshooting common problems

If Copilot gives you an error message or refuses to process your request, the most common cause is that your internet connection dropped. Copilot needs to verify your Microsoft 365 subscription online, even though the actual processing happens on your computer. Check your connection and try again.

If Copilot suggests a formula that does not work, it may be because the data format is not what it expected. For example, if a column contains dates formatted as text instead of actual date values, Copilot might suggest a formula that fails. In that case, you can ask it to "assume this column is text" or reformat the column first and ask again. If Copilot consistently misunderstands what you want, try being more specific about the data type or the exact output you need.

Frequently Asked Questions

Do I need to pay extra for Copilot in Excel?

No. Copilot in Excel is included with Microsoft 365 subscriptions at no additional cost. You do not need to buy a separate license or upgrade. If you have a basic Microsoft 365 subscription, you have access to it.

Can I use Copilot if I have Excel on my work computer?

Only if your work uses Microsoft 365 and your IT department has enabled Copilot for your organization. Many companies disable it for security reasons or because they have not rolled it out yet. Ask your IT support team whether it is available on your work account.

What happens to my data when I use Copilot?

Your data stays on your computer. Copilot processes it locally, not on Microsoft's servers. However, your requests are logged on your device so Microsoft can improve the feature. If you work with confidential information, you may want to turn off Copilot or clear your history regularly.

Can Copilot write macros or VBA code?

Copilot in Excel focuses on formulas and data analysis, not on writing VBA macros or automation code. For that, you would need a different tool like GitHub Copilot or a dedicated coding assistant.

What if Copilot is slowing down my Excel?

Close the Copilot panel when you are not actively using it. If Excel is still slow, check whether you have other programs running and close them. You can also disable Copilot temporarily by signing out of your Microsoft 365 account, though you will lose access to other cloud features too.